Is it possible to Highlight all Animation keyframes in the dope sheet and make all frames stick to a specific location, all at once?
I'd do as @Policesate suggests, make a backup of the original Blend file, then - Try making a master parent for the model.  From there the included animations should become local to the parent.  Either enter in your desired location for the parent or simply drag it there - keyframe that.
The included animations should stay with it.  If they've keyframed the root bone, and it takes the model somewhere else for the idle state or other action, go into the Graph editor and drag all of that action's X/Y keyframes up or down to drag it back.  Press G Y to ensure you don't drift sideways in the editor.